<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        #box{
            width: 200px;
            margin: 100px auto;
        }
        #box ul li{
            border: 1px solid #ccc;
            list-style-type: none;
            line-height: 45px;
            text-align: center;

        }
        #box ul li a{
            font-size: 25px;
            text-decoration: none;
            color: #f60;
        }
    </style>
</head>
<body>
    <div id="box">
        <ul id="div">
            <li><a href="复习.html">复习</a></li>
            <li><a href="显示与隐藏.html">显示与隐藏</a></li>
            <li><a href="练习.html">练习</a></li>
            <li><a href="练习1.html">练习1</a></li>
        </ul>
    </div>
</body>
</html>